/Engine/Source/Runtime/Engine/Classes/Engine/GameViewportClient.h
Calculate the amount of safezone needed for a single side for both vertical and horizontal dimensions
void CalculateSafeZoneValues ( [FMargin](API\Runtime\SlateCore\Layout\FMargin) & SafeZone, [UCanvas](API\Runtime\Engine\Engine\UCanvas) * Canvas, int32 LocalPlayerIndex, bool bUseMaxPercent )